where \(h\) , \(\mu \) , \(\nu _1\) , \(\nu _2\)  and \(\lambda \)  are constants,
while \(\operatorname{sn}{u}\) ,
\(\operatorname{cn}{u}\)  and \(\operatorname{dn}{u}\)  are the Jacobian elliptic functions [1]} modulus \(k\)  (\(0<k^2< 1\) ).
Eq. (REF ) reduces to the associated Lamé equation when \(\nu _1(\nu _1+1)=\nu _2(\nu _2+1)=0\) , and to
the Lamé equation when \(\nu _1(\nu _1+1)\)\(=\nu _2(\nu _2+1)=\)\(\lambda (\lambda +1)=0\) .
